Biggest German-Speaking Cities

Name the biggest urban areas in the world where German is the most commonly-spoken language.
Population in terms of urban area, not city proper
According to citypopulation.de, for the year 2019
Quiz by Aaron197
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Last updated: January 30, 2020
First submittedJune 16, 2019
Times taken287
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Population
City
5.70 mil
(The Ruhr)
5.00 mil
Cologne/Dusseldorf
4.75 mil
Berlin
3.27 mil
Frankfurt
2.87 mil
Hamburg
2.42 mil
Stuttgart
2.27 mil
Munich
2.25 mil
Vienna
Population
City
1.58 mil
Mannheim
1.21 mil
Nuremberg
1.15 mil
Hanover
1.01 mil
Bremen
1.41 mil
Zurich
931 k
Bielefeld
826 k
Saarbrücken
823 k
Dresden
+1
Level 82
Jun 16, 2019
Further evidence that citypopulation.de shouldn't be relied on: The Cologne/Dusseldorf and Monchengladbach agglomerations overlap! (1 Buttgener Weg in Karst lies in both.) Agglomerations aren't even supposed to be adjacent, since citypopulation.de claims that: "The urban agglomeration are(sic) delimited by unsettled and not built-up areas."
+1
Level 51
May 17, 2020
I don't understand why Dusseldorf and Cologne are counted as one city. They are both completely different and independent cities?
+1
Level 68
May 17, 2020
I myself don't quite know why that is, but I write what citypopulation.de considers as an urban agglomeration.